//import java.util.scanner;
public class arithmeticOperation{
	 public static void main(String[] args){
		// Scanner input = new Scanner(System.in);
		// int i=1;
		// i=i++;
		// System.out.println(i);
		// i=++i;
		// System.out.println(i);
		int i1 = 10;
		int i2 = 20;
		int i = i1++;
		System.out.println(i);
		System.out.println(i1);
		System.out.println(i2);
		i = --i2;
		System.out.println(i);
		System.out.println(i1);
		System.out.println(i2);
	}
}